Rotary drum filter



2 Sheets-Sheet 1 Filed Dec. 27, 1945 INVENToR. OPV/LLI;- B- H CKEELX JE.

June 7, 1949. o. B. ACKERLY, JR

ROTARY DRUM FILTER 2 Sheets-Sheet 2 Filed D60. 27, 1945 w/EE cai/sz PEEMHTEX (5t-HL) INVENTOR.

OPV/ITLE B. HCKELYJ vdi?.

Patented June 7, 1949 Orville B.,Aokerly,.J., Piedmontalil., aissignor; Ito Oliver --Unitedf Filters Incorporated, iaklantl;k (Jalif.a :corporation of Neuada- Application December 27, 1945, Serial No, 637,345

'G'Glaims 1.

This invention relates in general to rotary 'd-rumlters andmore particularly tothe dec-k of dri-iml Ioff such a filter.

As-is- Wellknown inthe-art, rotary drum lte'rs include a rotary filter drum provided at either -endlivlth trunnions journaled in bearings -mounted onda filter The surface of the :drum is diviiiledinto -a lplurality -off independent -andllongi'- `tudinally extending iifltrateY compartments by longitudinal-ly extending, peripherally lspa-ced `division strips, each communicating through in- *terna/l' conduits with an 'automatic valve associated with one of thedrum trunnions and by means of'whiichfeach compartmentfis successively subjected to a differential' filtering pressureand toa blowback pressure.

Disposed within each of the iiltrate 'compartmentsis a 4drainagescreen; and surrounding the structure soiormed--is -a'fgrid or screen for supporting 'a fabricated filter medi-urn. -su'pporting screenlor grid-sometimes'talres the f-orm of.. :a continuous wire winding surrounding` the fel-rum. Ordinarily `thewfire/iis ywound on' 1A inch centers, vandv consequently it `will ibeseen 'that :about Y2 1/3 milles -fofwire is requiredv in wind-ing'an eight-foot diameter, ten-foot face drum. Alt though a wire woundd-eck serves as Aan excellent support iior thellilt-er medi-um'y 'i-thas severaldisadvantages. In llthe rst pla-ce, lsince the wire expands and contracts with' variations in temperature, the winding becomes 'loose 4upon an increase 1in temperature. Upon a decrease in temperature the Wire becomes taut and on occasions will break. When a-break occurs the wire .drumI has y.to y be completely .rewound andv this of course means that the lter is :shut down fora considerable length of time.

In general Athe object of this invention is the provision of a deck .for a rotaryzdrum lterinclud :in'gfa .plurality of peripherallyispaced, ilongitudinally :extending rigid' barsisecnred to ithe; youl'ier face of the drum and a plurality of separate, parallel and interdigitated grid bars individually and detachably secured to the rigid bars to form a continuous parallel grid structure surrounding the drum.

The invention possesses other advantageous features, some of which with the foregoing will be set forth at length in the following description Where that form of the invention which has been selected for illustration in the drawings accompanying and forming a part of the present specification is outlined in full. In said drawings, one form of the invention is shown, but it is to be understood that it is not limited to such form,

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2, sin-ce theV inventiolzi .as set forth in the claims ina-y^:belembodied'tir-r` ai Ipli-iralityzof forms.

Reierring: to ntl'iey draiilings:

Fig; 1i isa :fragmentary vertical section italien through :a iilterwdnum providednwithf a deck ern*- -bodying the obte'ctsziof imy invention.

Fig. 2 is a sectiontakeni.ontt'he-section line 2-2 nfFig; 1i.

Eig: 3 isvai sectionitalcenion xthezsection line '3 3 of Fig. 1.

Fig. 14'? iiszzai fragmentaryf'ventical section taken timori-gna .clmimgprovided 'withwa deck vsuch as is showrrvini Figs;` Il, 2 fan'd1r3fr .and illustrating fthe manner inwind-lr the :sections are removed.

Fig, :5i iis' az firagineizrtary` longitudinal ysection ztakeni through 9;.;deck'lenib-odying' the objects of myiinnention'iand showrig'the: method by which thefiwnveniwirerltercoyerisasealed over and to fthe: dineisections :immediatelyzabcve the division :stripsLA vof theiadnumzsol saisit@` form independent filtrate compartments.

As shown in these various figures, the :objects `of'myinventionhave 'beam-,embodied in a rotary `drinn.filter:.inclddii-iig.'.aissteelidinm if on vwhich are 'welded :ai mleiralitywo. peripheral'ly spaced longitudinally extending frigidribs :on bars 2. Weldedto eltherwsideoflcertainiof these ribs 2a, which-aman .hereafter be .designated vas division .stri-p. :ba-rs, A:are.l'origitiiclinally :extending shoulder :bars 3 g ,theseibarsbei-ng located? substantiallymid way the ftopiand blttern-nf the division strips.

Support-edi ontheidrvisionstrip bars Maand on the rigid bars 2 arezflexible -Wire 'sections or .grid .barsffneachiprovided onziboth .of its `ends with an untlnrturnednor underlying; hookI 5 .arrangedto engage @the lower(edgey ofi-.the shoulder 'bars .3. Mani-'fthe grid: barsrfsi; fsubtending any itwo lcon- :tignaus'div-isionstrip bars 2a arespaced laterally @distance eqnalutionthei-diameter .of Ythe Vwires or :bars :bythe lhuok: i5 :of :another:.similarV parallel .setz/of: ieridlbarsilnengasngleach-fofithe two constiguous division strip bars 2a at one end and secured at their opposite ends to the next succeeding division strip bars 2a. In this manner each of the filtrate compartments extending between any two contiguous division strip bars 2a is covered by a set of longitudinally spaced parallel grid bars, the adjacent filtrate compartment defined by one of these division strip bars and the next succeeding division strip bar being covered with an intervening set of longitudinally spaced grid bars 4.

Each of the resilient and normally straight grid bars 4 is readily installed by securing the hook 5 at one of its ends beneath the shoulder bar 3 of one of the division strips and then bending the section 4 downwardly so as to spring the hook 5 at its opposite end over the shoulder bar 3 of the next succeeding division strip bar. This having been done, other grid bars are similarly secured in place over each compartment until the entire drum has been covered.

To remove any one of the grid bars 4, the hooked end 6 of a tool 'l is placed beneath one of the hooks of the grid bars and then the tool 1 is fulcrumed about the adjacent rib 2 as shown on the right side of Figure 4 so as to pull the hook 5 of the grid bar 4 away from the shoulder bar 3. In the left side of Figure 4, the tool 1 has completed the removal of the hook 5, the grid bar 4 being shown in its normally straight condition.

After the entire surface of the filter drum has been built up with the wire grid bars 4 as above described, so as to form a continuous parallel grid structure over the drum, a filter medium in the form of a woven Wire screen or cover 8 is placed around lthe deck grid so formed and is sealed to the overlapping hooked ends of the.

grid bars 4 immediately above and along the division strip bars 2a by any suitable sealing compound 9 such as Permatex- The cross-sectional form of the grid bars is immaterial although conveniently they can be made from heavy resilient wire.

From the above description it will be noted that I have provided a sectionalized grid decking which can be readily made to form a true cylindrical surface and which can be easily repaired at any desired point by simply removing one or more of the damaged grid bar sections in the manner above described. Obviously a grid decking of this kind obviates the necessity of completely unwinding and winding the continuous spiral wire decking lpreviously used on filters of this type.

I claim:

1. A drum of a rotary drum filter comprising: a plurality of peripherally spaced, longitudinally extending division strip bars secured and sealed to said drum and each provided on each of its sides with a longitudinally extending shoulder; and a plurality of rods overlying each successive pair of division strip bars transversely thereof, each end of each of said rods terminating in a downwardly and inwardly extending hook and each of said hooks being detachably secured under one of said shoulders.

2. A drum of a rotary drum filter comprising: a plurality of peripherally spaced, longitudinally extending division strip bars secured and sealed to said drum; independent grid bars overlying each successive pair of division strip bars transversely thereof; and means for detacliably securing each end of each of said grid bars to one of said division strip bars, the grid bars overlying one pair of division strip bars being laterally offset with respect to the grid bars overlying the next succeeding pair of division strip bars in lnterdigitating relation thereto.

3. A drum of a rotary drum iilter comprising: a plurality of peripherally spaced, longitudinally extending rigid bars secured and sealed to the outer face of said drum; a first set of independent and parallel grid bars overlying and detachably secured to a rst selected pair of said rigid bars transversely thereof; and a second set of independent and parallel grid bars overlying and detachably secured to a second selected pair of said rigid bars transversely thereof, the ends of the first set of grid bars being disposed between the ends of said second set of grid bars.

4. A drum of a rotary drum filter comprising: a plurality of longitudinally extending peripherally spaced rigid bars secured and sealed to the outer surface of said drum; and a plurality of parallel, separate and interdigitated grid bars overlying said rigid bars transversely thereof and individually and detachably secured there to form a parallel grid structure surrounding said drum.

5. A drum of a rotary drum iilter comprising: a 'plurality of peripherally spaced, longitudinally extending rigid bars secured and sealed to the outer surface of said drum, each of said bars being provided with lateral shoulders; a plurality of resilient parallel, separate and interdigitated grid bars overlying said rigid bars transversely thereof to form a continuous parallel grid structure overlying said drum; and undei'-, lying hooks formed on the ends of said gridbars, said hooks being detachably secured to said shoulders.

6. A drum of a rotary drum filter comprising: a plurality of longitudinally extending and peripherally spaced division strip bars secured to and dividing said drum into a plurality of separate ltrate compartments; a plurality of separate and parallel grid bars overlying certain selected pairs of division strip bars transversely thereof; and a plurality of separate and parallel grid bars overlying other selected pairs of division strip bars transversely thereof, said grid bars being individually and detachably secured to said division strip bars and forming a parallel grid structure surrounding and bounding said filtrate compartments.

ORVILLE B. ACKERLY, J R.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS uniber Name Date 748,756 Kuchenmeister Jan. 5, 1904 2,289,411 Denhard et al July 14, 1942 

